What is the inductive reactance of a 2.50-mH coil at 1000 Hz?
A) 2500 ?
B) 796 ?
C) 15.7 ?
D) 2.50 ?
C
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Isotopic evidence for the presence significant quantities of liquid water on Mars in the past comes from the observation of
A) an elevated ratio of deuterium to hydrogen B) an elevated ratio of hydrogen to deuterium C) a complete absence of hydrogen in the atmosphere D) a complete absence of deuterium in the atmosphere
If the inflation theory is correct, the geometry of the universe is flat and Euclidean
Indicate whether the statement is true or false
A point on the rim of a 0.25-m-radius rotating wheel has a centripetal acceleration of 4.0 m/s2 . What is the angular speed of the wheel?
a. 1.0 rad/s b. 2.0 rad/s c. 3.2 rad/s d. 4.0 rad/s
Fission fragments tend to be radioactive because they have
A) more protons than neutrons. B) more neutrons than protons. C) too many more protons than neutrons. D) too many more neutrons than protons. E) the same number of neutrons as protons.